Q&A for How to Make Raisins

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  • Question
    How long does it take for a grape to turn into a raisin?
    wikiHow Staff Editor
    Staff Answer
    This answer was written by one of our trained team of researchers who validated it for accuracy and comprehensiveness.
    wikiHow Staff Editor
    Staff Answer
    If you use the sunlight method, it will take at least 3 days. You’ll need dry, sunny conditions for it to work! You can do it a little faster in a dehydrator, which takes about 24 hours. The oven technique takes only a few hours, but you’ll have to be very careful not to burn your grapes.
  • Question
    What kind of grapes are used to make raisins?
    wikiHow Staff Editor
    Staff Answer
    This answer was written by one of our trained team of researchers who validated it for accuracy and comprehensiveness.
    wikiHow Staff Editor
    Staff Answer
    You can make raisins out of many different kinds of grapes, but seedless grapes work best. In the U.S., most raisins you buy in the grocery store (both the purple and golden ones) are made from a green variety called Thompson Seedless.
  • Question
    Why do raisins not spoil?
    wikiHow Staff Editor
    Staff Answer
    This answer was written by one of our trained team of researchers who validated it for accuracy and comprehensiveness.
    wikiHow Staff Editor
    Staff Answer
    Raisins keep for a long time because they have so little water content. The high amount of concentrated sugar in dried fruits like raisins also makes them pretty inhospitable to bacteria. As long as you store your raisins in a cool, dry place, they can stay good for about a year.
  • Question
    What will happen if it gets wet?
    Community Answer
    There is a possible chance of mold. Keep grapes as dry as possible during the 'drying' process.
  • Question
    What if my home grown grapes are very tart and sour?
    Community Answer
    If your home grown grapes are tart or sour tasting, add 1tsp sugar to 1 cup cold water, let the grapes soak for about 4 hours. Then strain the grapes and start the drying process over again.
  • Question
    As I dry my grapes, do I need to worry about the hornets that seem to be attracted to them?
    Samuel C. King
    Community Answer
    Yes, if you're drying your grapes out in the sun, you should make sure they're covered so that insects won't be able to get at them and potentially place bacteria or other unwanted substances on them.
  • Question
    Is there sugar in grapes?
    Community Answer
    Yes, one grape contains approximately 0.4 grams of sugar. About 7 grapes contains the equivalent of a sugar cube. However, sugar in fruits is much healthier for your body than processed/refined sugars.
  • Question
    How can I tell if grapes are rotting?
    Community Answer
    Some common traits of bad grapes are a soft texture, a brown discoloration, and they will begin to smell a little like vinegar when they are left too long and begin to ferment. Mold will eventually start to appear, so be sure to discard any rotten grapes.
  • Question
    Why do you have to bleach them and put them on a tray?
    Community Answer
    It kills germs. If the grapes have been handled with dirty fingers, then it can give you food poisoning.
  • Question
    Will it work with other fruits?
    Community Answer
    It depends on the fruit. For example, cranberry raisins exist. They are made by drying cranberries in the sun. Other fruits may not work so well with the same process, for example, a banana.
  • Question
    Can I make raisins from any type of grape?
    Community Answer
    Yes, you should be able to use any type of grape. But, depending on the type of grape, the flavor may vary.
  • Question
    How do I keep them from molding?
    Samuel C. King
    Community Answer
    You should store them in an airtight container, preferably one that has very little air in it to begin with. Then, either store them in the refrigerator or in a cool, dry place, such as a pantry.
  • Question
    How can I wake up with great ideas?
    Community Answer
    Try brainstorming with friends. Write down all of your ideas. Any ideas you wake up with will most likely be influenced by whatever you were dreaming about, and it's very hard to control what you dream about.
  • Question
    What if our grapes have seeds?
    Community Answer
    This will not change the process of turning them into raisins. All grapes typically have seeds.
  • Question
    Can you dehydrate grapes in the oven?
    Samuel C. King
    Community Answer
    Yes, it's actually a relatively straightforward process. See the steps above to find out how to dehydrate grapes in an oven.
  • Question
    Does this process of drying fruits involve smoking?
    Community Answer
    No, it doesn't involve smoking. It only calls for drying the grapes out in the sun.
  • Question
    How do I make grapes?
    Community Answer
    Grapes grow on a vine. If you want to grow grapes, find grape vines to plant.
  • Question
    Do I make raisins from seeded or seedless grapes?
    Community Answer
    You can use either type of grapes when making raisins using this process. Typically, most raisins have seeds.
  • Question
    Why do the grapes need to have the stems on them before drying?
    Community Answer
    In my experience, this is because the juice of the grapes will come out in the process and the stems make it easier to handle them. Having the stems can also keep the grapes fresh while drying.
  • Question
    How do I know if my grapes are dry enough when making raisins?
    Community Answer
    The grapes will be dry to touch. However be sure to wash your hands before touching the grapes. Another method you could try is blotting your grapes with a paper towel. If no water residue comes off, your grapes are dry enough.
  • Question
    What do I do if insects get to the grapes when making raisins?
    Community Answer
    Make sure they do not get to the grapes. They can cause infection (both bacterial and fungal) or even lay eggs. So, cover them up with thin net or cloth. If they have insect infestation, they're only good for the compost.
  • Question
    Would making raisins be possible by just drying out the grapes while they're still on a vine?
    Community Answer
    Unfortunately, it is not possible. Environmental factors can degrade the grape. Birds can poop on the grape, thus getting bacteria on it, which can for sure ruin the dehydrating process. And the longer they're left, the more likely something or someone else will get the grapes first.
  • Question
    Do I have to remove the stems from the grapes to make raisins?
    Community Answer
    Yes, or else it will affect the end result, and if you're using an oven, it might catch on fire or stink up your oven; I speak from experience!
  • Question
    Can raisins be made in a microwave oven using grapes?
    Community Answer
    No; a microwave isn't designed for dehydrating. Your grapes will swell and explode.
  • Question
    My oven goes 350 degrees and up. How high does the temperature need to be on my oven?
    Community Answer
    You want the oven to be at 225 F. If your oven doesn't go this low, you could try leaving the door open a little and/or reducing the cooking time. Just be sure to keep an eye on them.
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